Just a thought on the invites. Rather than ordering online.. it might be worth coming up with your own if you need other stationery items? for the candy bar labels etc.
Candy in aqua and lime will be hard to come by?
I would throw in some white...
but... You should be able to get:
Cupcake wrappers and then have the frosting coloured.
Lollipops - try lollipopbrides.com.au (and be sure and tell Emma I sent you) These would make fab take home gifts.
Wrapped chocolate bars (you can buy paper or print it).. and wrap chocolate bars (i buy chocolate that has a foil layer underneath so you can remove the branding wrapper and then rewrap. Takes no time at all and is super simple to do.
Chocolate dipped pretzels (you could colour the white chocolate with a gel colour) or have it as a 'white' treat.
You can custom order M&Ms in your choice of colours too.
http://www.mymms.com/weddings/ They do not ship internationally but you could get them via one of the shop/shipping outlets like comgateway.com
You could also try somewhere like this
http://candyaddictions.com.au/ there is sure to be one in Melbourne?? Not sure about this place
http://www.designercandy.com.au/ quality looks lacking to me.
Mints are also a great inclusion.. and they are white
You could also look at sugar coated cookies..
Relabelled water bottles.
flowers and ribbons will also help push the colour theme.
A coloured tablecloth will also help.
http://www.pinkfrosting.com.au/ might also be able to help you out?